If your aware with the Scenario Select code then try this. Once you beat Scenario 2 use the Scenario Select code and go back to Scenario 2. Select your soldiers for Garrett, but take archers for Baldarov, (Barbarians are weak against archers). Now when you begin, keep in mind that Baldarov doesn't need any experience. Have Garrett attack the enemy killing only the barbarians. When the Shaman's army is gone, kill him. Then go and assist Baldarov who is defending Mina. If you use the archers against the barbarians with 10HP, you should reduce their number at least four or so; have Garrett finish the weak barbarians off and take all the experience. Repeat the procedure with the rest of the enemies in Scenario 2. By the time you are done with this, Garrett should have had at least 1 class change. Don't worry if you don't get to Level 10 with Garrett, just go back and do it again.